Lecture 19 – Arthropoda

Lecture 19 – Arthropoda - Lecture 19...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
A phylum name; Arthro- (“jointed”), –poda (“foot”) A. Important features 1. Paired, jointed appendages (defines arthropods) This gives more flexibility in movement The classes are defined by these appendages- they can be uniramous or biramous o Uniramous – unbranched o Biramous - branched Insects have 6 legs 2. Exoskeleton Have exoskeletons hardened by chitin, and some have calcium carbonate in addition to chitin which makes it even harder Advantages o Get protection against predators o Some protection against drying out o Provides support Disadvantages o Limits mobility (less than something with internal skeleton) o Must molt in order to grow, this makes them vulnerable to predators 3. Open circulatory system Crabs and lobsters are a lot more mobile than a worm, but how can this be with an open circulatory system? The respiratory system compensates for this 4. Segmented body (fig. 30-24) – an advancement evolutionary-wise. Maybe some segments fused together and formed three segments? a.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Lecture 19 – Arthropoda - Lecture 19...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online